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A method is described for measuring relative values of the magnetizing force along the path traversed by the recording medium in passing through a magnetic recording or reproducing head. Field-distribution curves obtained by this method are shown. A method for calculating the frequency response of a reproducing head from field-distribution data is presented, and results of calculations are compared with a measured frequency response. In the recording process, the important part of the field lies in the air gap. The highfrequency response depends on the sharpness of cutoff on the "leaving" side of the gap, and is independent of the shape on the "approaching" side.
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Clark et al. (1947) studied this question.
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